Muaj ntau ntau hom thiab muaj peev xwm ntawm naj hoom fwj ntawm lub khw. Xws li cov tshuaj tsuag fwj, yob-on fwj, reed diffuser fwj thiab lwm yam. Ntawm lawv, cov tshuaj tsw qab lub raj mis yog mos
Cov khoom siv raw khoom zoo no ruaj khov thiab txhim khu kev qha, ib txwm ua raws li cov kev xav tau ntawm peb lub tuam txhab los muab cov khoom zoo raws li peb cov kev xav tau.